JPS6034016B2 - High frequency heating device with heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-frequency heating device with a heater that prevents heat from escaping through a door when the heater is activated.

Conventionally, as this type of high-frequency heating device, one in which glass plates on which reflective surfaces are formed are arranged side by side on the inside of a door is known.

When the heater is activated, this transparent glass plate prevents heat from escaping from the heating chamber to the outside through the door, thereby heating the object near the door and eliminating uneven heating overall. It fulfills its function. However, in a high-frequency heating device with such a configuration, even if a transparent glass plate is used, a reflective surface is formed, so the inside of the heating chamber cannot be clearly seen during operation, and the object to be heated cannot be seen clearly. It was impossible to accurately determine the degree of heating. Since the glass plate protrudes into the heating chamber when the door is closed, the effective area within the heating chamber becomes narrow, and at the same time, the object to be heated tends to come into contact with the reflective surface of the glass plate.
There is also the drawback that this reflective surface is damaged, resulting in a decrease in reflection efficiency with long-term use. Therefore, the purpose of this invention is to be able to stably prevent heat from escaping through the door over a long period of time, to allow the object to be heated in the heating chamber to be clearly seen when necessary, and to provide an effective area for the heating chamber. An object of the present invention is to provide a high-frequency heating device with a heater having a door that does not cause the possibility of narrowing the space.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A high-frequency heating device with a heater according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

In Fig. 1 and Fig. 2, the heating chamber 2 is located in the middle of the river with reference numeral 2.
1 is formed. A horizontally opening door 22 that can open and close a heating chamber 21 having a rectangular window portion 23 is pivotally supported on the front surface of the main body 20. A heating chamber 2 is provided in the main body 20.
A magnetron 24 that oscillates high frequency waves is provided in the heating chamber 1, and an upper heater 25 and a lower heater 26 are provided in the heating chamber 21 and spaced apart from each other in the vertical direction. A cooking select button 27, a timer 28, a range switch 29, and a heater switch 30 are provided on a panel 20a provided on the front surface of the main body 20, respectively. Further, on the front surface of the door 22, an operating heir 31 for opening and closing a shutter, which will be described later, is provided so as to be movable in the vertical direction. As shown in detail in FIG. 3, the door 22 includes a frame 32, an outer barrier 33, a shutter 34, and a wire mesh, which are arranged in the window 23 of the frame 32 at a predetermined interval from the outside. 35 and an inner barrier 36.

Thus, the shutter 34 is located between the outer barrier 33 and the inner barrier 36 and is provided within the door 22. As shown in FIG. 4, this shutter 34 includes a pair of fixed support frames 37 whose upper and lower ends are respectively attached to the frame body 32, and a support frame 37 on the right that extends vertically parallel to the rear support frame 37. It has a movable ridge 38 extending to. The movable rod 38 has its upper and lower ends supported by the upper and lower ends of the frame 32 via coils 39 and 40, respectively, and moves upward or downward against the urging force of these coils 39 and 40. It is movable relative to the support rod 37.
A large number of fins 41 are provided between the pair of fixed support rods 37, each of which extends across the window 23 and is arranged in parallel at a predetermined interval in the vertical direction. Pivot pins 42 are provided on both end surfaces of each fin 41 to protrude in the horizontal direction, and these pins 42 are loosely inserted into holes formed in the support birch 37, so that each fin 41
is rotatable in a vertical plane about a pivot pin 42 as shown by an arrow. Further, a drive pin 43 is provided on the right end surface of each fin 41 so as to protrude rearwardly from the pivot pin 42 at a predetermined distance. These drive pins 43 are loosely inserted into holes formed in the movable bar 38, and thus, the fins 41 are rotated by vertical movement of the movable bar 38. A guide pin 44 is protruded near the lower end of this movable rod 38, and this pin 44 is attached to a swinging lever 44 whose central portion is pivotally supported by the support rod 37.
It is loosely inserted into a slit 46 formed near the rear end. The front end of the swing lever 45 extends from the front surface of the frame 32, and the operating heir 31 is attached to this extended end. As a result, by operating the operating knob 31 in the vertical direction, the vertical movement of the pad 38 is caused by the vertical movement of the swing lever 4.
It is carried out through 5. In FIG. 4, reference numeral 47 indicates a protective cover made of a heat-resistant and heat-insulating material, such as heat-resistant plastic. This protective cover 47 is attached to the frame 32 so as to be positioned between the frame 32 and the operating heir 31, and when the knob 31 is manually operated, the surface of the heated frame 32 is It has a function to prevent accidental touching of fingers. As shown in FIG. 5, the fins 41 are formed of a metal plate, for example, and when a material with low heat reflection on the surface, such as iron, is used, the inner surface is coated with aluminum or nickel to provide reflection. A film is formed. Of course, the fins 41 are not limited to being formed from a plate, but may be formed from a hollow fan-flat cylinder, for example, as shown in FIG.

In this case, the fins 41 may be formed by seam welding metal plates such as stainless steel. The hollow fins 41 have a better heat insulating effect than plate fins due to the air present therein. In order to further increase this heat insulating effect, the inside may be evacuated or a heat insulating material may be enclosed. In the high-frequency heater with heating heater configured as described above, when the operating heir 31 is moved downward, the fins of the shutter 34 are rotated downward via the movable shank 38, as shown in FIG. It is closed like this.

As a result, the shutter 34 prevents the heat in the heating chamber 21 from escaping outward through the window 23 of the door 22. On the other hand, when the operating droplet 31 is moved upward, the shutter 34 is opened as shown in FIG. 4 by rotating the fin upward. As a result, the inside of the heating chamber 21 can be clearly seen from the outside. Therefore, by opening and closing the shutter 34 as necessary during high frequency heating (microwave cooking, heater heating, grill cooking, oven cooking), effective cooking can be achieved. The difference in thermal efficiency between the case where the shutter was provided and the case where the shutter was not provided as described above was measured when the temperature inside the heating chamber was controlled to about 200 oo. The results are shown in FIG.

In FIG. 7, the vertical axis indicates the temperature in the heating chamber, Yokoto indicates the heater energization time, the solid line indicates the case with a shutter, and the two-dot chain line indicates the shutter condition. Further, symbols a and A indicate the time when the heater is in the ON state, and symbols b and B indicate the time when the heater is in the OFF state, respectively. From this measurement result, when the heating chamber is equipped with a shutter, the time to 200 qo is not only faster, but also the operating rate (a voice main
It is understood that the 0 states will improve by 7-8%. In the heating device of the above embodiment, the shutter provided on the door was constructed with fins arranged in parallel in the vertical direction, but it may also be formed with fins arranged in parallel in the horizontal direction, an example of which is shown in Fig. 8. This will also be explained with reference to FIG.

In this example, the same parts as in the previous embodiment are denoted by the same reference numerals, and detailed explanation will be omitted.

Shutter 341...[has a rectangular shutter frame 48,
Support pins 42 of the fins 41 are loosely inserted into holes formed in the upper and lower plates of the frame 48 so as to be spaced apart from each other in the left-right direction. As a result, the fins 41 are arranged side by side with a predetermined distance from each other in the left-right direction, and the fins 41 are rotatable about the pivot pin 42, that is, about the vertical axis. Further, a movable rod 38 that can move in the left and right direction is provided on the bottom surface of the lower slope of the shutter frame 48. The movable fins 38 are provided with slits 49 spaced apart from each other in the length direction and each extending in the middle direction, and the driving pins 43 of the fins are formed in the arc-shaped slits 49 with downward slopes. 51 and is loosely inserted. The shutter 3111 configured in this manner is opened and closed by sliding the movable rod 38 in the direction of the arrow via the operating head 31 protruding from the movable rod 38. Further, this shutter 34 is made into a unit with the above configuration, and by designing the dimensions of the shutter frame to match the dimensions of the window part 23 of the frame 32 of the door 22, this unitized shutter 34 can be made into a unit. It can be easily inserted into the window section 23 and mounted. Therefore, this shutter 34 is placed in the window portion 23 after inserting the outer barrier 33, then the wire mesh 35 and the inner barrier 36 are sequentially inserted, and finally they are pressed with the rectangular contact piece 50. The door 22 is assembled by fixing the contact piece 50 to the frame body 32 with screws. In the above embodiment, the opening and closing of the shutter 34 is controlled by manually operating the operating droplet 31 provided on the front surface of the heating device, but it may also be linked with appropriate switches provided on the heating device. An example of this will be explained below with reference to FIG.

FIG. 10 shows a shutter 34 having the same structure as the shutter shown in FIG. 4 except for the drive mechanism for the movable fin 38.

The lower end of this movable rod 38 is pivotally supported by an actuator 53 of an electromagnetic plunger 52, and when this plunger 52 is excited, the actuator 53 is pulled, and the movable rod 38 is moved by the biasing force of the coil spring 39. be moved against it. As a result, fin 4
1 is rotated downward about the pivot pin 42, and the shutter 34 is closed. Then, when the plunger 52 is deenergized, the movable rod 38 is moved upward by the coil spring 39, and the shutter 34 is opened as shown in FIG. The electromagnetic plunger 52 exhibiting the above action is
The lead wire (not shown) passes through the frame 32 of the door 22, is led into the main body 20 from the door hinge, and is connected to the heater switch 30 (FIG. 1) when the switch 30 is pressed. connected to be energized.

This switch 30 is connected to the upper heater 25 and lower heater 26 (
It is connected to a known drive circuit so that when pressed, both heaters 25 and 26 are turned on and off for oven cooking. Therefore, when this switch 30 is pressed, the shutter 34 is closed and oven cooking can be started at the same time. Instead of being connected to move in conjunction with the heater switch 30, the electromagnetic plunger 52 may be connected to move with the range switch 29 (FIG. 1), and may also be connected to move in conjunction with both switches 29 and 30.

Also, the movable member 3 connected to the electromagnetic plunger 52
8, a swing lever 45 and an operating heir shown in FIG. 4 are added, and the shutter 34 can be manually operated when necessary even during cooking.
It may also be possible to open the .

As explained above, the high-frequency heating device with a heating timer according to the present invention prevents heat from escaping from the heating chamber through the door when the door is closed between the inner barrier and the outer barrier of the door. It is equipped with a shutter that allows you to see inside the heating chamber when it is opened.

As a result, when the shutter is closed, even the object to be heated near the door can be heated and cooked with good thermal efficiency, and when the shutter is opened as necessary, the heating status of the object to be heated can be clearly seen. As a result, the cooking time can be shortened and the operating rate of the heater can be reduced.
Moreover, since this shutter distributes grain in the space between the inner barrier and outer barrier, which were previously not used at all, the effective area of the heating chamber is not reduced, and there is no risk of damage caused by objects to be heated, saucers, etc. There is no risk of

[Brief explanation of drawings]

1 and 2 are a schematic front view and a sectional view of a high-frequency heating device with a heating heater according to an embodiment of the present invention,
Fig. 3 is a cross-sectional view of the door of the heating device, Fig. 4 is a perspective view of the door with partial defects, Fig. 5 is a partial perspective view of the fins of the shutter, and Fig. 6 is a portion showing a modified example of the fins. A perspective view, FIG. 7 is a line diagram for explaining the degree of improvement in the heater operation rate of the heating device of the example, FIG. 8 is an exploded perspective view showing a modification of the door with a shutter, and FIG. A partial perspective view, and FIG. 10 is a partial perspective view for explaining a modification of the door with a shutter. 20...Main body, 21...Heating chamber, 22...Door, 3
3...Outer barrier, 34...Shutter, 36...Inner barrier, 41...Fin. Figure 1 Figure 2 Figure 3 Figure 4 Figure 6 Figure 5 Figure 7 Figure 9 Figure 10 〇 Ship

Claims (1)

[Claims] 1. A main body including a heating chamber, a heater that heats the inside of the heating chamber, a switch that turns on and off electricity to the heater, and a door provided on the main body and having an inner barrier and an outer barrier. , the door is provided between the inner barrier and the outer barrier of the heating chamber, and includes a shutter that can be closed to prevent heat from escaping in the heating chamber, and a shutter that closes when the heater is turned on. A high-frequency heating device with a heater, characterized in that the high-frequency heating device is equipped with a drive means for interlocking the shutter with the switch so as to open the shutter when the shutter is closed and the power supply to the heater is turned off.